Indoor vacuum circuit breakerDetailed product description：

ZN28Z-12 series integral vacuum circuit breaker

Product features
1. Complete product range: rated current from 630A to 4000A, rated short-circuit breaking current
From 20kA to 50kA.
2. Advanced miniaturized copper chromium contact longitudinal magnetic field arc extinguishing chamber
3. Convenient and flexible structural forms and installation methods
4. Guaranteed high reliability and stability
5. Good product series and universality, easy to maintain and use for users
6. Complete product type test: rated short-circuit opening and closing current, rated dynamic stability, full capacity opening and closing
The original indicators such as the DC component value during interruption are higher than the national standards.

Technical parameters of ZN28Z-12kV indoor vacuum circuit breaker

serial number	name		unit	model
				ZN28-12/20	ZN28-12/25	ZN28-12/32	ZN28-12/40	ZN28-12/50
one	rated voltage		kV	twelve
two	rated current		A	six hundred and thirty one thousand one thousand two hundred and fifty	one thousand one thousand two hundred and fifty	one thousand one thousand two hundred and fifty two thousand	one thousand two hundred and fifty one thousand and six hundred two thousand two thousand and five hundred three thousand one hundred and fifty	four thousand
three	1-minute power frequency withstand voltage	Phase by phase ground	kV	forty-two
		fracture		forty-eight
four	Lightning impulse withstand voltage	Phase by phase ground		seventy-five
		fracture		eighty-four
five	Rated short-circuit breaking current		kA	twenty	twenty-five	thirty-one point five	forty	fifty
six	Rated short-circuit breaking current breaking times		time	fifty	fifty	fifty	thirty	twenty
seven	Percentage of DC component					45%	45%	35%
eight	Rated dynamic stability current (peak value)		kA	fifty	sixty-three	one hundred	one hundred and thirty	one hundred and thirty
nine	4s thermal stability current		kA	twenty	twenty-five	thirty-one point five	forty	fifty
ten	Rated operating sequence			★	★	★	☆	☆
eleven	Rated out of step breaking current		kA			eight	ten	twelve point five
twelve	Rated earth fault breaking current for different phases		kA	seventeen point three	twenty-one point seven	twenty-seven point three	thirty-four point six	forty-three point three
thirteen	Rated breaking current of a single capacitor bank		A	six hundred and thirty
fourteen	Rated back-to-back capacitor bank breaking current		A	four hundred
★O-0.3s-CO-180s-CO ☆O-180s-CO-180s-CO